As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ODOR OF SMOKE IN THE CABIN. RTFL. AFT LAV FIRE DETECTOR WENT OFF IN FLIGHT. TESTED AFT LAV FIRE DETECTOR. OPS CHECK OK. RAN PACKS AND ALL SHIP POWER TO TRY TO SIMULATE CONDITIONS WHERE FIRE DETECTOR WENT OFF. AFT FIRE DETECTION WORKED NORMALLY. FOUND NOTHING ABNORMAL. WITH CREW CONCURRENCE, OK FOR SERVICE.